dynatracs Full Float Pro Rock 60 - high Pinion Gearset - Photo 07

The differential is a crucial part of the axle's strength. The Pro Rock 60 uses a high-pinion Dana 60 gearset, which is a substantial upgrade over the JK's Dana 44. While the hubs may do the heavy lifting, the ring-and-pinion takes the brunt of the force needed to propel the Jeep.